#include <stdio.h>
#include <math.h>
#include <stdlib.h>
int a[8];
char *day[] = {"", "MONDAY", "TUESDAY", "WEDNESDAY", "THURSDAY", "FRIDAY", "SATURDAY", "SUNDAY"};
int main()
{
    int i, t, j;
    a[4] = 6;
    for (i = 1; i <= 3; i++)
    {
        a[i] = 2;
        if (!a[i + 3])
            a[i + 3] = 7;
        else
        {
            a[i] = 0;
            continue;
        }
        for (t = 1; t <= 3; t++)
        {
            if (!a[t])
                a[t] = 5;
            else
                continue;
        if (!a[t + 2])
            a[t + 2] = 4;
        else
        {
            a[t] = 0;
            continue;
        }
        for (j = 5; j < 7; j++)
        {
            if (!a[j])
                a[j] = 3;
            else
                continue;
            if (!a[j + 1])
                a[j = 1] = 1;
            else
            {
                a[j] = 0;
                continue;
            }
            for (i = 1; i <= 7; i++)
                printf(" doctor %c is on duty %s\n", 'A' + a[i] - 1, day[i]);
            exit(0);
        }
        }
    }
}
